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CN-122024624-A - Driving method, driving circuit and display device of display panel

CN122024624ACN 122024624 ACN122024624 ACN 122024624ACN-122024624-A

Abstract

The invention provides a driving method, a driving circuit and a display device of a display panel, wherein in the driving method of the display panel, firstly, a pixel group is arranged in a non-display area of the display panel, the pixel group comprises a second sub-pixel and a third sub-pixel, in a detection period, target gray scales with positive polarity and negative polarity are respectively output to the second sub-pixel and the third sub-pixel, after a first preset time period and a second preset time period are respectively delayed, the output is turned off, the voltages of pixel electrodes of the two sub-pixels are obtained, the size of feed-through voltage is determined according to the voltages of the two pixel electrodes, and the target common electrode voltage is determined according to the size of the feed-through voltage, so that the compensation of the common electrode voltage is realized, the feed-through voltages in the sub-pixels can be mutually offset under the drive of positive polarity and negative polarity, the direct current bias is eliminated, the display effect is improved, the self-adaptive adjustment of the driving voltage is realized, and the compensation efficiency is high.

Inventors

  • CHEN JINSHUI

Assignees

  • 绵阳惠科光电科技有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The driving method of the display panel is characterized in that the display panel comprises a display area and a non-display area surrounding the display area, the display area comprises a plurality of rows of scanning lines, a plurality of columns of data lines and first sub-pixels arranged in an array, the first sub-pixels are correspondingly connected with one scanning line and one data line, the non-display area comprises at least one group of pixel groups, the pixel groups comprise a second sub-pixel and a third sub-pixel, and the second sub-pixel and the third sub-pixel are correspondingly connected with one scanning line and one data line; the driving method of the display panel comprises the following steps: In the detection period, respectively outputting a target gray-scale voltage with positive polarity and a target gray-scale voltage with negative polarity to the second sub-pixel and the third sub-pixel, delaying for a first preset time period, and then stopping outputting the target gray-scale voltage; After delaying for a second preset time length, obtaining a second voltage of a pixel electrode of the second sub-pixel and a third voltage of a pixel electrode of the third sub-pixel, and determining the size of a feed-through voltage according to the second voltage and the third voltage; And determining a target common electrode voltage according to the feed-through voltage, and outputting the target common electrode voltage to the first sub-pixel, the second sub-pixel and the third sub-pixel in a display period.
  2. 2. The method of driving a display panel according to claim 1, wherein before outputting the target gray-scale voltage of positive polarity and the target gray-scale voltage of negative polarity to the second subpixel and the third subpixel, respectively, further comprising: periodically outputting a self-detection voltage to the second sub-pixel in the detection period, and acquiring a second voltage of a pixel electrode of the second sub-pixel; And when the second voltage does not reach the preset voltage within a third preset time period, periodically increasing the voltage amplitude of the row scanning signals output to the first sub-pixel, the second sub-pixel and the third sub-pixel until the second voltage reaches the preset voltage within the third preset time period, and respectively outputting a target gray-scale voltage with positive polarity and a target gray-scale voltage with negative polarity to the second sub-pixel and the third sub-pixel.
  3. 3. The driving method of a display panel according to claim 2, wherein the row scan signal is composed of a row on signal and a row off signal; And when the second voltage is detected to not reach the preset voltage within the third preset time period, periodically increasing the voltage amplitude of the row scanning signals output to the first sub-pixel, the second sub-pixel and the third sub-pixel until the second voltage reaches the preset voltage within the third preset time period, wherein the method comprises the following steps: And when the second voltage does not reach the preset voltage within the third preset time period, periodically increasing the voltage of the row opening signal and/or reducing the voltage of the row closing signal until the second voltage reaches the preset voltage within the third preset time period.
  4. 4. The method of driving a display panel according to claim 3, wherein the outputting of the target gray-scale voltage after the outputting of the target gray-scale voltage is stopped after the outputting of the target gray-scale voltage of the positive polarity and the target gray-scale voltage of the negative polarity to the second sub-pixel and the third sub-pixel, respectively, is delayed for a first preset period of time during the detecting period, comprises: Outputting the row start signal to the second and third sub-pixels and outputting a positive polarity target gray scale voltage and a negative polarity target gray scale voltage to the second and third sub-pixels at charging timings of the detection period; And after delaying for a first preset time period, outputting the line closing signal to the second sub-pixel and the third sub-pixel so as to cut off outputting the target gray scale voltage to the second sub-pixel and the third sub-pixel.
  5. 5. The method of driving a display panel according to claim 4, further comprising, after the delaying for a second preset period of time, obtaining a second voltage of the pixel electrode of the second sub-pixel and a third voltage of the pixel electrode of the third sub-pixel: Before the display period, outputting target grayscale voltages of opposite polarities to the second and third sub-pixels, respectively, to reset the second and third sub-pixels.
  6. 6. The driving method of a display panel according to claim 1, wherein the feedthrough voltage is equal to an inverse value of an average value of a sum value of the second voltage and the third voltage.
  7. 7. The driving method of a display panel according to claim 1, wherein the target common electrode voltage is equal to a voltage difference between an initial common electrode voltage and the feedthrough voltage.
  8. 8. A driving circuit of a display panel, comprising: The source electrode driving circuit is used for outputting gray-scale voltages in a controlled manner; The grid driving circuit is used for outputting a row scanning signal in a controlled way, wherein the row scanning signal comprises a row opening signal and a row closing signal; A common voltage circuit for controlled output of a common electrode voltage; and a detection control circuit connected to the source driving circuit, the gate driving circuit, and the common voltage circuit, respectively, for controlling the source driving circuit, the gate driving circuit, and the common voltage circuit to implement the driving method of the display panel according to any one of claims 1 to 7.
  9. 9. A display device comprising a display panel and the drive circuit of the display panel according to claim 8, wherein the drive circuit of the display panel is connected to the display panel.
  10. 10. The display device according to claim 9, wherein the display panel includes an array substrate, a counter substrate, and a liquid crystal layer disposed between the array substrate and the counter substrate; The first sub-pixel comprises a first thin film transistor and a first pixel electrode which are arranged on the array substrate, wherein the first thin film transistor is correspondingly connected with a scanning line, a data line and the first pixel electrode respectively, the first pixel electrode forms a first storage capacitor with a first common electrode of the array substrate and forms a first liquid crystal capacitor with a second common electrode on the opposite substrate respectively, and the first common electrode and the second common electrode are used for inputting a common electrode voltage; The second sub-pixel comprises a second thin film transistor and a second pixel electrode which are arranged on the array substrate, wherein the second thin film transistor is correspondingly connected with a scanning line, a data line and the second pixel electrode respectively, the second pixel electrode forms a second storage capacitor with a first common electrode of the array substrate and forms a second liquid crystal capacitor with a second common electrode on the opposite substrate respectively, and the second pixel electrode is also connected to a driving circuit of the display panel through a via hole; The third sub-pixel comprises a third thin film transistor and a third pixel electrode which are arranged on the array substrate, the third thin film transistor is correspondingly connected with a scanning line, a data line and the third pixel electrode respectively, the third pixel electrode forms a third storage capacitor with a first common electrode of the array substrate and forms a third liquid crystal capacitor with a second common electrode on the opposite substrate respectively, and the third pixel electrode is connected to a driving circuit of the display panel through a via hole.

Description

Driving method, driving circuit and display device of display panel Technical Field The present invention relates to a driving method, a driving circuit and a display device for a display panel. Background Along with the development of display panels to high resolution, high refresh rate and narrow frame, the size of thin film transistors in pixels is continuously reduced, and the process pressure is increased. When the display panel works for a long time or the manufacturing process has flaws, the thin film transistor in the pixel is easy to generate aging effect, namely the phenomena of rising threshold voltage and reducing mobility of the thin film transistor. The aging of the thin film transistor also causes the increase of on-resistance and insufficient pixel charging, so that when the thin film transistor is turned off, the feed-through voltage generated by parasitic capacitance between the grid electrode and the source electrode of the thin film transistor changes, thereby causing the drift of the feed-through voltage of the pixel electrode, the drift of the feed-through voltage cannot be completely counteracted under positive and negative polarity driving, and finally, the drift is represented as direct current bias of the pixel voltage, flicker is caused to appear on the display panel, and even afterimage is caused to appear. In order to solve the direct current bias caused by feed-through voltage drift, the existing scheme reflects the aging condition of the thin film transistor by detecting the rising rate of a line scanning signal, but the method lacks self-adaptive adjustment capability, can only correct a line on signal, a line off signal, a common electrode voltage and the like according to an empirical value, cannot realize optimal compensation, and has low compensation efficiency. Disclosure of Invention The invention aims to provide a driving method of a display panel, which aims to solve the problem of low compensation efficiency of the traditional compensation mode. A first aspect of an embodiment of the present invention provides a driving method of a display panel, where the display panel includes a display area and a non-display area surrounding the display area, the display area includes a plurality of rows of scan lines, a plurality of columns of data lines, and first sub-pixels arranged in an array, the first sub-pixels are correspondingly connected to one of the scan lines and one of the data lines, the non-display area includes at least one group of pixel groups, the pixel groups include a second sub-pixel and a third sub-pixel, and the second sub-pixel and the third sub-pixel are respectively correspondingly connected to one of the scan lines and one of the data lines; the driving method of the display panel comprises the following steps: In the detection period, respectively outputting a target gray-scale voltage with positive polarity and a target gray-scale voltage with negative polarity to the second sub-pixel and the third sub-pixel, delaying for a first preset time period, and then stopping outputting the target gray-scale voltage; After delaying for a second preset time length, obtaining a second voltage of a pixel electrode of the second sub-pixel and a third voltage of a pixel electrode of the third sub-pixel, and determining the size of a feed-through voltage according to the second voltage and the third voltage; And determining a target common electrode voltage according to the feed-through voltage, and outputting the target common electrode voltage to the first sub-pixel, the second sub-pixel and the third sub-pixel in a display period. Optionally, before the outputting the target gray-scale voltage with positive polarity and the target gray-scale voltage with negative polarity to the second sub-pixel and the third sub-pixel, the method further includes: periodically outputting a self-detection voltage to the second sub-pixel in the detection period, and acquiring a second voltage of a pixel electrode of the second sub-pixel; And when the second voltage does not reach the preset voltage within the third preset time period, periodically increasing the voltage amplitude of the row scanning signals output to the first sub-pixel, the second sub-pixel and the third sub-pixel until the second voltage reaches the preset voltage within the third preset time period, and respectively outputting a target gray-scale voltage with positive polarity and a target gray-scale voltage with negative polarity to the second sub-pixel and the third sub-pixel. Optionally, the line scanning signal is composed of a line opening signal and a line closing signal; And when the second voltage is detected to not reach the preset voltage within the third preset time period, periodically increasing the voltage amplitude of the row scanning signals output to the first sub-pixel, the second sub-pixel and the third sub-pixel until the second voltage reaches the preset voltage within the third preset ti